Translations of this page:
<Brightness>
<Brightness> == <Real>
A real number determines the brightness change of the picture or a picture area.
Nubers between -1.0 and 1.0 mean the brightness change itself, numbers between 1.0 and 100.0 - and -between -100.0 and -1.0 - will be interpreted as percent values, and divided by 100.